Charles h



@uiten tutes figment @ffice CHARLES H. PARSHAIJIHAOF' DETROIT, MICHIGAN.

Letters .Patent No. 73,639, dated January 21, 1868. 4

IMPROVEMENT AIN AIR-WHISTLBS.

die rigtule rfmh tu in tigese irtters @anni :mi making nari nj its sume.

TO ALL WHOM IT MAY CONCERN:

Bc it known that I, CHARLES H. PARSAHAL'L, of Detroit, inthe county ofWayne, and State of Michigan, have invented a. new and usefulImprovement in Air-Whistles for Fog-Alarms, Snc.; and I do herebydechire that the following is a full, clear, and exactidescrption of thesanne, reference being had to the annexed drawings, mekingpart oi' thisspeiication, in which Figure 1 is n. vertical section, and

Figure 2 isa top view.

The same letters are employed in both figures to designate the sameparts.

My invention relates to the class of whistles known as fog-alarmwhistles, 'in which a. continuous sound is maintained by the escape ofcompressed :tir into a whistle or horn, and it consists in n novelarrangement of the parts, us will be fully set forth in the followingdescription and claims. l

B, in the annexed drawings, is un air-pump, with n double-acting piston,D, working in a cylinder, into which the nir is alternately admittedbehind the piston,.through valves I, which are closed upon the returnstroke. H H are valves, opening outwardly, which permit the air toescape when the piston is travelling towards them, passing into thecylinder C, and thence' through the opening J, into the cylinder E. Inthe chamber of this cylinder E is a, tightly-tting plunger, K, which isso constructed -that it may be loaded to the' required extent. Thisplunger will be forced upwards b y the air pumped into the cylinder E. AA is en alarmwhistle, of the ordinary form of steam-whistles. This isplaced over the chamber C, andwhen the stop-cock, connecting it with thechamber, is opened, the ziir compressed in the chamber C and cylinder E-will rush out into the whistle, causing it to sound, and this actionwill continue with undiminished force until the plunger K has beenforced tothe bottom of the cylinder E. Al horn may be used instead ofthe whistle A.

' Whitt I claim as my invention` and desire to'secure by Letters Patent,is

The combination of the pump B, the air-chamber C, the cylinder E,plunger K` and whistle or horn A,

constructed and arranged to operate substantially as set forth.

CHARLES H. PARSHALL. Witnesses:

HoY'r' Pos'r, A. H. WILxINsoN.

